In _every_ activity I've ever participated in where I can observe many people's performance and progression - including powerlifting, bodybuilding, various ball sports, mathematics, chess, theoretical CS, software engineering, etc - it is transparently obvious that people's natural abilities vary dramatically.
Although it's not the most common scenario (training and experience do matter), I have seen many situations where someone with, say, 6 months' haphazard and lazy experience will absolutely crush the performance of someone with 3 years of serious and dedicated training.
Talent is real.